1 /* 2 * cs5535-mfd.c - core MFD driver for CS5535/CS5536 southbridges 3 * 4 * The CS5535 and CS5536 has an ISA bridge on the PCI bus that is 5 * used for accessing GPIOs, MFGPTs, ACPI, etc. Each subdevice has 6 * an IO range that's specified in a single BAR. The BAR order is 7 * hardcoded in the CS553x specifications. 8 * 9 * Copyright (c) 2010 Andres Salomon <dilinger@queued.net> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 23 */ 24 25 #include <linux/kernel.h> 26 #include <linux/mfd/core.h> 27 #include <linux/module.h> 28 #include <linux/pci.h> 29 #include <asm/olpc.h> 30 31 #define DRV_NAME "cs5535-mfd" 32 33 enum cs5535_mfd_bars { 34 SMB_BAR = 0, 35 GPIO_BAR = 1, 36 MFGPT_BAR = 2, 37 PMS_BAR = 4, 38 ACPI_BAR = 5, 39 NR_BARS, 40 }; 41 42 static int cs5535_mfd_res_enable(struct platform_device *pdev) 43 { 44 struct resource *res; 45 46 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 47 if (!res) { 48 dev_err(&pdev->dev, "can't fetch device resource info\n"); 49 return -EIO; 50 } 51 52 if (!request_region(res->start, resource_size(res), DRV_NAME)) { 53 dev_err(&pdev->dev, "can't request region\n"); 54 return -EIO; 55 } 56 57 return 0; 58 } 59 60 static int cs5535_mfd_res_disable(struct platform_device *pdev) 61 { 62 struct resource *res; 63 64 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 65 if (!res) { 66 dev_err(&pdev->dev, "can't fetch device resource info\n"); 67 return -EIO; 68 } 69 70 release_region(res->start, resource_size(res)); 71 return 0; 72 } 73 74 static struct resource cs5535_mfd_resources[NR_BARS]; 75 76 static struct mfd_cell cs5535_mfd_cells[] = { 77 { 78 .id = SMB_BAR, 79 .name = "cs5535-smb", 80 .num_resources = 1, 81 .resources = &cs5535_mfd_resources[SMB_BAR], 82 }, 83 { 84 .id = GPIO_BAR, 85 .name = "cs5535-gpio", 86 .num_resources = 1, 87 .resources = &cs5535_mfd_resources[GPIO_BAR], 88 }, 89 { 90 .id = MFGPT_BAR, 91 .name = "cs5535-mfgpt", 92 .num_resources = 1, 93 .resources = &cs5535_mfd_resources[MFGPT_BAR], 94 }, 95 { 96 .id = PMS_BAR, 97 .name = "cs5535-pms", 98 .num_resources = 1, 99 .resources = &cs5535_mfd_resources[PMS_BAR], 100 101 .enable = cs5535_mfd_res_enable, 102 .disable = cs5535_mfd_res_disable, 103 }, 104 { 105 .id = ACPI_BAR, 106 .name = "cs5535-acpi", 107 .num_resources = 1, 108 .resources = &cs5535_mfd_resources[ACPI_BAR], 109 110 .enable = cs5535_mfd_res_enable, 111 .disable = cs5535_mfd_res_disable, 112 }, 113 }; 114 115 #ifdef CONFIG_OLPC 116 static void cs5535_clone_olpc_cells(void) 117 { 118 static const char *acpi_clones[] = { 119 "olpc-xo1-pm-acpi", 120 "olpc-xo1-sci-acpi" 121 }; 122 123 if (!machine_is_olpc()) 124 return; 125 126 mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones)); 127 } 128 #else 129 static void cs5535_clone_olpc_cells(void) { } 130 #endif 131 132 static int cs5535_mfd_probe(struct pci_dev *pdev, 133 const struct pci_device_id *id) 134 { 135 int err, i; 136 137 err = pci_enable_device(pdev); 138 if (err) 139 return err; 140 141 /* fill in IO range for each cell; subdrivers handle the region */ 142 for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) { 143 int bar = cs5535_mfd_cells[i].id; 144 struct resource *r = &cs5535_mfd_resources[bar]; 145 146 r->flags = IORESOURCE_IO; 147 r->start = pci_resource_start(pdev, bar); 148 r->end = pci_resource_end(pdev, bar); 149 150 /* id is used for temporarily storing BAR; unset it now */ 151 cs5535_mfd_cells[i].id = 0; 152 } 153 154 err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells, 155 ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL); 156 if (err) { 157 dev_err(&pdev->dev, "MFD add devices failed: %d\n", err); 158 goto err_disable; 159 } 160 cs5535_clone_olpc_cells(); 161 162 dev_info(&pdev->dev, "%zu devices registered.\n", 163 ARRAY_SIZE(cs5535_mfd_cells)); 164 165 return 0; 166 167 err_disable: 168 pci_disable_device(pdev); 169 return err; 170 } 171 172 static void cs5535_mfd_remove(struct pci_dev *pdev) 173 { 174 mfd_remove_devices(&pdev->dev); 175 pci_disable_device(pdev); 176 } 177 178 static const struct pci_device_id cs5535_mfd_pci_tbl[] = { 179 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) }, 180 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) }, 181 { 0, } 182 }; 183 MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl); 184 185 static struct pci_driver cs5535_mfd_driver = { 186 .name = DRV_NAME, 187 .id_table = cs5535_mfd_pci_tbl, 188 .probe = cs5535_mfd_probe, 189 .remove = cs5535_mfd_remove, 190 }; 191 192 module_pci_driver(cs5535_mfd_driver); 193 194 MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>"); 195 MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device"); 196 MODULE_LICENSE("GPL"); 197